Electric heating device



E. SUTER ELECTRIC HEATING DEVI CE Filed June 4. 1923 IN VEN TOR.

2pm ,2 Z, TTORNEYS Patented Feb. 10, 1925.

UNITED STATES 1,525,624 PATENT OFFICE.

ERNEST SUTER, OF MILWAUKEE, WISCONSIN.

ELECTRIC HEATING DEVICE.

Application filed June 4, 1923.

To all whom it may concern:

Be it known that I, ERNEST SL'TER, a citizen of the Republic of Switzerland, and resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have in vented new and useful Improvements in Electric Heating Devices, of which the following is a. description, reference being had to the accompanyin drawings, which are a part of this speci cation.

This invention relates to improvements in electric heating devices.

It is one of the objects of the present invention to provide a device having an electrical resistance unit which is more particularly adapted to be used as a cigar lighter but may also be used to apply heat locally.

-A Ifurther object of the invention is to provide a device of the class described which can be threaded into an ordinary electrical socket.

A further object of the invention is to provide an electrical heating device in which the resistance unit 'is formed of carborundum or other like substance.

A further object of the invention is to provide an electric cigar lighter for use on automobiles and other localities where jarring and air current make it impossible to conveniently use other forms of lighters.

A further object of the invention is to provide a device of the class described which is of very simple construction, can becheap- 1y manufactured, is strong and durable, and

is well adapted for the purposes desired.

With the above and other objects in view, the invention consists of the improved electric heating device and its parts and combinations, as set forth in the claims, and all equivalents thereof.

Referring now more particularly to the accompanying drawing 1n which the same reference characters indicate the same parts in all of the views:

Fig. 1 is a cross-sectional view of the improved electric heating device;

Fig. 2 is a plan view thereof; Fig. 3 is a plan view of a modified rform of resistance unit;

Fig. 4 is a plan view of a second modified form of resistance unit; and

. Fig. 5 is a crom-sectional view of a modified form of the invention.

In the drawing, the numeral 8 re resents an electrical plug adapted to be t readed into an ordinary electrical socket and the Serial No. 643,392.

interior of the plug is formed with a cavity 9. A screw or contact member 10 is secured in the bottom portion of the plug and its inner end is connected to a metallic member 11. A second metallic member 12 is in connection with the metallic grooved jacket 13 of the plug and the =frce ends of said members 11 and 12 are bent upwardly as shown in Fig. 1. Soldered to the bent ends of members 11 and 12 are a pair of metallic caps 14 and 15 formed of ferro-silic'on. An elongated strip of carborundum 16 or'other like material spans the top portion of said plug and its ends may be covered by alumi num, if desired, and are received by said ferro-silicon caps 14 and 15 as shown in Figs. 1 and 2. Said strip of carborundum 16 has a covering consisting of crystalon and silicate which protects the strip against being oxidized by the air. A metallic flanged band 17 fits over the top portion of the plug, as shown and extends partially down the sides thereof and serves to hold the parts in place. Interposed between said band and the carborundum strip 16 is an insulating ring 18 formed of asbestos or a like composition.

In Fig. 3, a modified form of the resistance unit is illustrated. The carborundum strip 16 has a plurality of alternating, spaced slots 19 and this will increase the length of the resistance through which the electrical current travels.

Fig. 4 illustrates a second modified form of resistance unit and the purpose of this form is also to increase the length of the resistance. As will be seen, the resistance is formed of a plurality of narrow strips 16 parallel to each other and spaced apart. The ends of all of the strips are covered by individual metal ferro-silicon caps 15' and wires 20 connect pairs of adjacent caps. The current will travel through this form of resistance as indicated by the arrows, or vice versa. 5

In the form of the invention illustrated in Figs. 1 and 2 and utilizing the resistance unit there shown, or either of the modified -forms of resistance units, the openation of the device is as follows:

The plug is adapted to be used in an ordinary form of electrical socket and when the switch is turned on, a circuit will be coinpleted through members 12, 14, the resistance unit 16, 15, 11 and 10. When the current travels through the resistance unit,

the will quickly become incandescent and a. cigar may be applied thereto and be lightedethereby.

In Fig. 5 a form of the invention is shown which contem lates the application of a small area of iieat locally at any point desired, as'jin medical treatment, or for any other purpose. This form of thednvention includes a handle member 21 provided with a longitudinally extending aperture 22. A pair of wires 23 and 24 which are connected with a source of electrical supply (not shown) enter said aperture and are covered by an insulating covering 25. One of the wires as 23, extends into the socket of the handle as shown and then into the aperture 22 and connects with a terminal end'26 of the handle. Wire 24 is'broken as shown, and a pair of spaced separated contact fingers 27 are interposed therein. The innermost end of wire 24 then. connects with a second terminal end 26' of the handle. Between the outer ends of the terminals a resistance unit 16 of carborundum or a like material is held and its ends have metal ferro-silicon coverings 28 to prevent said ends from becoming incandescent. A rod 29 is positioned within the handle at right angles to the plane of the wires and between the contact fingers 27 and a contact ring 30 is formed on said rod. One'end of said rod carries a plunger 31 while the opposite end is formed with a push button 32. A spring 33 is coiled about said rod adjacent the push button and is confined within .a recess. When the push button is pressed inwardly the rod will move until the contact ring comes into contact .with both of the contact fingers, thereby completing the electrical circuit. When the push button is released,

the coiled spring will force it back to normal position disengaging the ring from the contact fingers, and the circuit will be broken thereby. The handle member is further provided with a hook or loop 34 which enables the device to be conveniently hung or sup ported. Also a clamping device 35 is pro-. vided for the terminals by which means they may be tightly dr n together to hold the resistance uniti' From the foregoing descriptionit will be seen that an improved form of electric heating device has been provided which is of i very simple construction, and is well adapted for the purpose described.

What I claim as my invention is:

1. An electric heating device comprising an insulating base provided with terminals,

a resistance strip having its ends formed a of ferro-silicon and supported in said base and in connection with said terminals, and,

electrical connections for said terminals.

2. An electric heatlng device comprising an insulating base provided with terminals,

a carborunduni resistance strip connecting having its ends covered by metallic sheaths,

said ends also resting on said conductor members, and electrical connections for conductor members.

4. An electric heating device comprising an insulating plug'threadable into an electric socket and having a cavity and an open end portion, conductor members within said plug and extending to the open. end portion.

at opposite sides thereof, an elongated carbonundum resistance strip having a crysta- 1011 and silicate coating, said strip spanning said open end portion and having-its endssaid covered by metallic sheaths, said ends also I resting on said conductormembers, and electrical connections for said conductor members.

5. An electric heating unit formed of a strip of crystalon and silicate coated carborundum and having its ends covered withferro-silicon.

6. An electric heating unit formed of an elongated, narrow'strip of crystalon and silicate coated carborundum with aluminum covered ends, said ends being held in ferrosilicon sheaths.

In testimony whereof, I affix my signature.

ERNEST sures. 

